IMHO:  This is all due to nearsighted and dangerous nationalism (aka populism).

"Why the UK and France are facing ‘fundamental transformations’" PBS NewsHour 12/10/2018

Excerpt

SUMMARY:  Political upheaval is building on both sides of the English Channel.  British Prime Minister Theresa May postponed a vote on her Brexit plan.  French President Emmanuel Macron vowed to increase wages to try and appease Paris protesters.  What does all this mean for the two leaders and the EU?  Nick Schifrin talks to Anand Menon of King’s College London and the Brookings Institution's Célia Belin.